Secondly the graphics in Mega Turrican were not 'tons better' either. Foreground graphics were the same, the Amiga version didn't have the background parallax graphics, but i'm actually at a loss as to how that would make it physically a 'better' game. Parallax has nothing to do with playability whatsoever.

I just checked them side by side, foreground graphics are very similar but not exactly the same.

I wonder why they didn't release an AGA version with the parallax retained. It would certainly have been doable.